.NET DNS类powershell后台可以工作吗？ [英] .NET DNS class powershell background job possible?

问题描述

我发现这个脚本，我修改了一些文件中的主机名：

I found this script which I modified a bit to take in the hostnames from a file:

http://tompaps.blogspot.com/2015/04/verify-forward-and-reverse-dns-records .html

它几乎遍历文件中的每个名称，ping它，将返回的IP转换为字符串，并在IP上执行反向查找。它的工作原理，但是当我有600多台机器通过性能是没有bueno。我知道与测试连接有一个-asjob参数，我可以用来运行异步作业，这是在几秒钟内完成的前瞻性工作，但有谁知道一种方式来模拟这种反向查找的行为？

It pretty much iterates through each name in the file, pings it, converts the returned IP into a string and performs a reverse lookup on the IP. It works, but when I have 600+ machines to go through performance is no bueno. I know with test-connection there's an -asjob parameter I can use to run asynchronous jobs which does the forwardlookup job in seconds but does anyone know a way to mimic this behavior for the reverse lookup?

我在这个论坛上发现了一个帖子，建议您可以使用.NET进程类做类似的事情，但是我刚刚在Powershell工作了好几个月，似乎解密MSDN文档。

I found a post on this forum suggesting you can do something similar using the .NET process class but I've just been working with Powershell for a few months and can't seem to decipher the MSDN docs.

推荐答案

如果有人感兴趣，我最终做了以下事情：

In case anyone's interested I ended up doing the following:

   Import-Module 'C:\Users\Lia Cha\Documents\Windows Powershell\Modules\Invoke-Parallel.psm1'

   $machines = Get-Content C:\work\hostnames.txt

   Invoke-Parallel -InputObject $machines -RunspaceTimeout 10 -Throttle 10 -ErrorAction SilentlyContinue -ScriptBlock {
   $obj = "" | Select ComputerName,Ping,IPNumber,ForwardLookup,ReverseLookup,Result  
   $obj.ComputerName = $_  

  # ping each host  
  if(Test-Connection $_ -quiet -Count 1){  
       $obj.Ping = "OK"  
 $obj.Result = "OK"  
  }  
  else{  
       $obj.Ping = "Error"  
 $obj.Result = "Error"  
  }  

  # lookup IP addresses of the given host  
  [array]$IPAddresses = [System.Net.Dns]::GetHostAddresses($obj.ComputerName) | ?{$_.AddressFamily -eq "InterNetwork"} | %{$_.IPAddressToString}  

  # caputer count of IPs  
  $obj.IPNumber = ($IPAddresses | measure).count  

  # if there were IPs returned from DNS, go through each IP  
    if($IPAddresses){  
 $obj.ForwardLookup = "OK"  

    $IPAddresses | %{  
         $tmpreverse = $null  

            # perform reverse lookup on the given IP  
         $tmpreverse = [System.Net.Dns]::GetHostEntry($_).HostName 
         if($tmpreverse){  

                 # if the returned host name is the same as the name being processed from the input, the result is OK  
              if($tmpreverse -ieq $obj.ComputerName){  
                   $obj.ReverseLookup += "$_ : OK `n"  
              }  
              else{  
                   $obj.ReverseLookup += "$_ different hostname: $tmpreverse `n"  
                   $obj.Result = "Error"  
              }  
         }  
         else{  
              $obj.ReverseLookup = "No host found"  
              $obj.Result = "Error"  
         }  
 }  
  }  
  else{  
       $obj.ForwardLookup = "No IP found"  
       $obj.Result = "Error"  
  }  

  # return the output object  
  $obj | ft -AutoSize | out-string -width 4096 | out-file c:\work\Results.txt -Append}

这超过了450+机器约4分钟。

This ran over 450+ machines in about 4mins.

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